首页
登录
职称英语
Space is a dangerous place, not only because of meteors (流星) but also becaus
Space is a dangerous place, not only because of meteors (流星) but also becaus
游客
2024-05-23
31
管理
问题
Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The【26】again acts as our protective blanket on earth. Light gets through, and this is【27】for plants to make the food which we eat. Heat, too, makes our environment【28】Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are【29】off. As soon as men leave the atmosphere they are exposed to this【30】and their spacesuits or the walls of their spacecraft, if they are inside, do【31】a lot of radiation damage.
Radiation is the greatest known danger to【32】in space. The unit of radiation is called "rem". Scientists have reason to think that a man can put up with far more radiation than 0.1 rein without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is【33】difficult to be sure about radiation damage—【34】, and this will not be discovered until the birth of deformed children or even grandchildren. Missions of the Apollo flights have had to cross belts of high amounts of reins.【35】, we simply do not know yet how men are going to get on, when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory. Drugs might help to decrease the damage done by radiation,【36】 [br]
Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth. Light gets through, and this is essential for plants to make the food which we eat. Heat, too, makes our environment endurable Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation and their spacesuits or the walls of their spacecraft, if they are inside, do prevent a lot of radiation damage.
Radiation is the greatest known danger to explorers in space. The unit of radiation is called "rem". Scientists have reason to think that a man can put up with far more radiation than 0.1 rein without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is extremely difficult to be sure about radiation damage—a person may feel perfectly well, but the cells of his or her sex organs may be damaged, and this will not be discovered until the birth of deformed children or even grandchildren. Missions of the Apollo flights have had to cross belts of high amounts of reins. So far, no dangerous amounts of radiation have been reported, but the Apollo missions have been quite short , we simply do not know yet how men are going to get on, when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory. Drugs might help to decrease the damage done by radiation, but no really effective ones have been found so far
选项
答案
but no really effective ones have been found so far
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3606917.html
相关试题推荐
Whenchildrencallaboy"foureyes",becausehewearsglasses,theyarespeakin
Deafnesscanbeaserious______becauseitneedsexcellenthearinginsomekinds
Theauthoriswell______withtheproblemsinthehospitalbecausehehasbeen
IdisapproveofdietssostronglybecauseIthinkit’swrongto______yourbod
Becauseadegreefromagooduniversityisthemeanstoabetterjob,education
Washetryingtoputmeoffthe______becauseIhadcometooclosetothetroth
Iam______ofhischancesofpassingtheexaminationbecausehehasnotworked
Thispicturehasits______value,becauseitistheoriginalofPicasso.A、extin
Wehadtowalkwith______onthatdangerous,icyslope.A、cautionB、precautionC
Hegot______ofhiscolleaguesandwontheprizebecauseofhisgreatachievemen
随机试题
ThedayofprotestingatEnglishWikipediabroughtmeasurableresults,1.___
Forthispart,youareallowed30minutestowriteashortessay.Youshouldsta
程是:
中药发霉的主要因素不包括A.药材含水量超过15%B.中药本身"发汗"C.储存温度
审计人员在审查被审计单位固定资产减值准备时,应关注的内容有()。A.减值准备转回
肠梗阻的典型临床表现不包括A、均匀性腹胀 B、腹泻 C、呕吐 D、肛门停止
1962年,美国女生物学家莱切尔?卡逊在( )一书中第一次提出了20世纪人类生
在行政复议中可作为复议依据,在行政诉讼中则只能作为审判参照的是()。A.行政
商业银行由于资金周转的需要,以未到期的合格票据再向中央银行贴现时所适用的利率称为
关于融资租赁,下列说法不正确的是A.甲是从事饲料加工的企业,甲将企业的厂房、机器
最新回复
(
0
)